P'yŏngan-bukto · North Korea · 40.20° N · 124.53° E
Solar position in Uiju
Sun position, daylight and the best solar panel angle for Uiju — computed for 40.20° N, 124.53° E, 26 m above sea level.
The sun right now
Sun in Uiju today
Sunday, 25 October 2026 · local time UTC+9
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 05:31 | sun 18° below horizon |
| Nautical dawn | 06:03 | 12° below |
| Civil dawn | 06:35 | 6° below |
| Sunrise | 07:02 | 105° ESE |
| Golden hour ends | 07:40 | sun 6° up |
| Solar noon | 12:25 | 37.7° high |
| Golden hour starts | 17:10 | sun 6° up |
| Sunset | 17:48 | 255° WSW |
| Civil dusk | 18:16 | 6° below |
| Nautical dusk | 18:48 | 12° below |
| Astronomical dusk | 19:19 | 18° below |
| Day length | 10 h 46 min | |
Sun path diagram for Uiju
Where the sun stands in the sky: the centre is straight overhead, the outer ring is the horizon. Numbers mark local clock hours.
- June solstice
- Equinox
- December solstice
- Today
On the June solstice the sun reaches 73.2° at solar noon in Uiju; on the December solstice only 26.4°. Sunrise swings from 58° ENE in June to 121° ESE in December — a 63° arc along the horizon.
Sunrise, sunset and sun height by month
Values for the 21st of each month, local clock time including daylight saving time.
| Month | Sunrise | Solar noon | Sunset | Day length | Noon elevation |
|---|---|---|---|---|---|
| January | 07:59 | 12:53 | 17:46 | 9 h 47 min | 29.9° |
| February | 07:27 | 12:55 | 18:23 | 10 h 56 min | 39.2° |
| March | 06:44 | 12:49 | 18:54 | 12 h 10 min | 50.0° |
| April | 05:55 | 12:40 | 19:26 | 13 h 31 min | 61.7° |
| May | 05:21 | 12:38 | 19:55 | 14 h 35 min | 70.0° |
| June | 05:12 | 12:43 | 20:14 | 15 h 02 min | 73.2° |
| July | 05:29 | 12:48 | 20:06 | 14 h 37 min | 70.3° |
| August | 05:58 | 12:44 | 19:31 | 13 h 33 min | 61.9° |
| September | 06:28 | 12:34 | 18:41 | 12 h 13 min | 50.5° |
| October | 06:58 | 12:26 | 17:54 | 10 h 56 min | 39.1° |
| November | 07:33 | 12:27 | 17:21 | 9 h 47 min | 29.9° |
| December | 08:00 | 12:39 | 17:18 | 9 h 18 min | 26.4° |
A year of daylight in Uiju
Each column is one day of 2026. Bright: sun above the horizon; soft: civil twilight; line: solar noon. Steps are daylight saving time changes.
Best solar panel angle in Uiju
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
39°collects the most energy over a year: 1422 kWh per kWp.
34°gives the most in the darkest month — the one an off-grid system is sized for.
- Yearly energy
- Worst-month energy
| Tilt | kWh/kWp per year | Share of best year | July kWh/kWp/day | Best ÷ worst month |
|---|---|---|---|---|
| 0° | 1157 | 81% | 3.40 | 2.7× |
| 15° | 1318 | 93% | 3.44 | 1.9× |
| 30° | 1406 | 99% | 3.31 | 1.5× |
| 34° off-grid best | 1417 | 100% | 3.24 | 1.4× |
| 39° year-round best | 1422 | 100% | 3.15 | 1.5× |
| 40° = latitude | 1422 | 100% | 3.13 | 1.5× |
| 45° | 1417 | 100% | 3.01 | 1.6× |
| 60° | 1349 | 95% | 2.58 | 1.7× |
| 70° | 1263 | 89% | 2.22 | 2.0× |
| 90° | 1007 | 71% | 1.44 | 2.8× |
A fixed array in Uiju produces the most over a year at 39°. The design month for an off-grid system is July: at 34° it makes 3.24 kWh per kWp a day, 3% more than at 39°, and costs 0% of the yearly total. Why steep panels win winter.
Off-grid solar in Uiju at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 39° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 39° | Mean temp. |
|---|---|---|---|---|---|
| January snow | 2.34 | 4.54 | 4.23 | 3.77 | -8.6 °C |
| February snow | 3.07 | 4.75 | 4.38 | 4.16 | -5.4 °C |
| March | 4.24 | 4.66 | 4.20 | 4.69 | 0.5 °C |
| April | 4.97 | 4.05 | 3.54 | 4.52 | 7.4 °C |
| May | 5.53 | 3.61 | 3.06 | 4.37 | 14.2 °C |
| June | 4.96 | 3.01 | 2.49 | 3.66 | 19.4 °C |
| July | 4.25 | 2.73 | 2.22 | 3.15 | 22.7 °C |
| August | 4.46 | 3.29 | 2.69 | 3.59 | 22.9 °C |
| September | 4.35 | 4.19 | 3.52 | 4.16 | 18.3 °C |
| October | 3.30 | 4.29 | 3.72 | 3.89 | 11.0 °C |
| November | 2.30 | 3.93 | 3.52 | 3.35 | 2.3 °C |
| December snow | 2.02 | 4.32 | 4.00 | 3.48 | -6.2 °C |
| Year | 3.82 avg | 3.94 avg | 1263 kWh | 1422 kWh |
Sizing example. To run a 1 kWh-per-day load through July on LiFePO4 batteries (charge controller, battery and inverter losses included) you need about 530 Wp of panels at 70°, versus 370 Wp at 39°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Uiju
Distance between rows of 2 m long panels (slope length) so that no row shades the next between 10:00 and 14:00 solar time on the winter solstice.
5.1 mrow pitch at 70°
4.5 mrow pitch at 39°
How Uiju compares in North Korea
Against the other 96 places in North Korea with climate data, for a fixed array at its best angle.
70thof 97 places in North Korea for sunshine, shared: 3.82 peak sun hours a day on flat ground.
±0%solar energy a year compared with the average place in North Korea: 1,422 against 1,424 kWh per kWp.
+8 mindaylight on the longest day, compared with Pyongyang: 15 h 02 min against 14 h 55 min.
39°best year-round tilt here; across North Korea it runs from 34° in Ongjin to 44° in Namyang-nodongjagu.
Of the 97 places in North Korea, Sinp’o and one other place get the most sun (3.91 peak sun hours a day) and Ŏrang and one other place the least (3.70); Uiju ranks joint 70th. In its darkest month, July, 1 kWp of off-grid panels at 70° makes 2.22 kWh a day here, against 2.28 kWh on average in North Korea. The shortest day lasts 9 h 18 min, −7 min compared with Pyongyang.
Solar forecast for Uiju, next 48 hours
Expected output of 1 kWp at 70°, computed from the ICON-EU weather model of the Deutscher Wetterdienst (DWD), Europe.
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Questions about the sun in Uiju
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Places near Uiju
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A free, live card for Uiju: where the sun is right now on today's path, a countdown to sunset or sunrise, the daylight change, the moon phase at night and the best panel angle.
Sun positions: NREL Solar Position Algorithm. Climate: NASA POWER monthly climatology (NASA Langley Research Center). Forecast: Deutscher Wetterdienst, ICON-EU (CC BY 4.0), processed. Places: GeoNames (CC BY 4.0). Time zones: IANA. Sources and licences.